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Finding the Fourth Proportional to 518.34, 715.08 and 319.11

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Solution

The fourth proportional to 518.34, 715.08 and 319.11 is: 440.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.34 : 715.08 = 319.11 : x
  2. Step 2: Convert to fraction form
    518.34/715.08 = 319.11/x
  3. Step 3: Cross multiply
    518.34x = 715.08 × 319.11
  4. Step 4: Simplify right side
    518.34x = 228,189.18
  5. Step 5: Solve for x
    x = 228,189.18/518.34
  6. Step 6: Final answer
    x = 440.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.